کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6618309 | 459654 | 2012 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Titanium and vanadium oxynitride powders as pseudo-capacitive materials for electrochemical capacitors
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Titanium and vanadium oxynitride powders as pseudo-capacitive materials for electrochemical capacitors Titanium and vanadium oxynitride powders as pseudo-capacitive materials for electrochemical capacitors](/preview/png/6618309.png)
چکیده انگلیسی
TiOxNy and VOxNy powders have been synthesized using oxide precursors and a conventional nitridation method. It enables to control of oxygen content and surface area. The electrochemical performances of the different powders have been investigated. A strong dependence on the surface area as well as on the nature of the oxynitride has been found. A typical value of 300 μF cmâ2 has been determined for VOxNy powders, while TiOxNy powders only show 50 μF cmâ2. In this last case it is believed that only double layer capacitance or weak redox reactions participate in charge storage mechanism while for vanadium based oxynitrides, a thin layer below the surface (â4 Ã
) is involved in charge storage via faradic reactions. VOxNy electrodes can be operated in different aqueous electrolytes, but only double layer capacitance is measured in neutral electrolytes. The highest capacitance values (â80Â FÂ gâ1) are measured in KOH and fair cycling ability is achieved when the electrochemical window is limited, thus avoiding oxidative potentials.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 82, 1 November 2012, Pages 257-262
Journal: Electrochimica Acta - Volume 82, 1 November 2012, Pages 257-262
نویسندگان
R. Lucio Porto, R. Frappier, J.B. Ducros, C. Aucher, H. Mosqueda, S. Chenu, B. Chavillon, F. Tessier, F. Cheviré, T. Brousse,